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1 | /* |
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2 | * libev epoll fd activity backend |
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3 | * |
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4 | * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions are |
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9 | * met: |
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10 | * |
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11 | * * Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * |
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14 | * * Redistributions in binary form must reproduce the above |
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15 | * copyright notice, this list of conditions and the following |
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16 | * disclaimer in the documentation and/or other materials provided |
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17 | * with the distribution. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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23 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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25 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 | */ |
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31 | |
1 | #include <sys/epoll.h> |
32 | #include <sys/epoll.h> |
2 | |
33 | |
3 | static int epoll_fd = -1; |
34 | static void |
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35 | epoll_modify (EV_P_ int fd, int oev, int nev) |
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36 | { |
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37 | int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL; |
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38 | |
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39 | struct epoll_event ev; |
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40 | ev.data.u64 = fd; /* use u64 to fully initialise the struct, for nicer strace etc. */ |
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41 | ev.events = |
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42 | (nev & EV_READ ? EPOLLIN : 0) |
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43 | | (nev & EV_WRITE ? EPOLLOUT : 0); |
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44 | |
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45 | if (epoll_ctl (epoll_fd, mode, fd, &ev)) |
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46 | if (errno != ENOENT /* on ENOENT the fd went away, so try to do the right thing */ |
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47 | || (nev && epoll_ctl (epoll_fd, EPOLL_CTL_ADD, fd, &ev))) |
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48 | fd_kill (EV_A_ fd); |
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49 | } |
4 | |
50 | |
5 | static void |
51 | static void |
6 | epoll_reify_fd (int fd) |
52 | epoll_poll (EV_P_ ev_tstamp timeout) |
7 | { |
53 | { |
8 | ANFD *anfd = anfds + fd; |
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9 | struct ev_io *w; |
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10 | |
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11 | int wev = 0; |
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12 | |
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13 | for (w = anfd->head; w; w = w->next) |
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14 | wev |= w->events; |
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15 | |
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16 | if (anfd->wev != wev) |
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17 | { |
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18 | int mode = wev ? anfd->wev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL; |
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19 | struct epoll_event ev; |
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20 | ev.events = wev; |
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21 | ev.data.fd = fd; |
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22 | fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, anfd->wev, wev, mode,//D |
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23 | epoll_ctl (epoll_fd, mode, fd, &ev) |
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24 | );//D |
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25 | anfd->wev = wev; |
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26 | } |
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27 | } |
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28 | |
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29 | void epoll_postfork_child (void) |
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30 | { |
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31 | int i; |
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32 | |
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33 | epoll_fd = epoll_create (256); |
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34 | |
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35 | for (i = 0; i < anfdmax; ++i) |
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36 | epoll_reify_fd (i); |
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37 | } |
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38 | |
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39 | static void epoll_reify (void) |
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40 | { |
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41 | int i; |
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42 | for (i = 0; i < fdchangecnt; ++i) |
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43 | epoll_reify_fd (fdchanges [i]); |
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44 | } |
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45 | |
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46 | static struct epoll_event *events; |
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47 | static int eventmax; |
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48 | |
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49 | static void epoll_poll (ev_tstamp timeout) |
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50 | { |
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51 | int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); |
54 | int eventcnt = epoll_wait (epoll_fd, epoll_events, epoll_eventmax, ceil (timeout * 1000.)); |
52 | int i; |
55 | int i; |
53 | |
56 | |
54 | if (eventcnt < 0) |
57 | if (eventcnt < 0) |
55 | return; |
58 | return; |
56 | |
59 | |
57 | for (i = 0; i < eventcnt; ++i) |
60 | for (i = 0; i < eventcnt; ++i) |
58 | fd_event ( |
61 | fd_event ( |
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62 | EV_A_ |
59 | events [i].data.fd, |
63 | epoll_events [i].data.u64, |
60 | (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP | EPOLLPRI) ? EV_WRITE : 0) |
64 | (epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
61 | | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) |
65 | | (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) |
62 | ); |
66 | ); |
63 | |
67 | |
64 | /* if the receive array was full, increase its size */ |
68 | /* if the receive array was full, increase its size */ |
65 | if (eventcnt == eventmax) |
69 | if (expect_false (eventcnt == epoll_eventmax)) |
66 | { |
70 | { |
67 | free (events); |
71 | free (epoll_events); |
68 | eventmax += eventmax >> 1; |
72 | epoll_eventmax = array_roundsize (epoll_events, epoll_eventmax << 1); |
69 | events = malloc (sizeof (struct epoll_event) * eventmax); |
73 | epoll_events = malloc (sizeof (struct epoll_event) * epoll_eventmax); |
70 | } |
74 | } |
71 | } |
75 | } |
72 | |
76 | |
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77 | static int |
73 | int epoll_init (int flags) |
78 | epoll_init (EV_P_ int flags) |
74 | { |
79 | { |
75 | epoll_fd = epoll_create (256); |
80 | epoll_fd = epoll_create (256); |
76 | |
81 | |
77 | if (epoll_fd < 0) |
82 | if (epoll_fd < 0) |
78 | return 0; |
83 | return 0; |
79 | |
84 | |
80 | ev_method = EVMETHOD_EPOLL; |
85 | fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); |
81 | method_fudge = 1e-3; /* needed to compensate fro epoll returning early */ |
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82 | method_reify = epoll_reify; |
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83 | method_poll = epoll_poll; |
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84 | |
86 | |
85 | eventmax = 64; /* intiial number of events receivable per poll */ |
87 | method_fudge = 1e-3; /* needed to compensate for epoll returning early */ |
86 | events = malloc (sizeof (struct epoll_event) * eventmax); |
88 | method_modify = epoll_modify; |
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89 | method_poll = epoll_poll; |
87 | |
90 | |
88 | return 1; |
91 | epoll_eventmax = 64; /* intiial number of events receivable per poll */ |
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92 | epoll_events = malloc (sizeof (struct epoll_event) * epoll_eventmax); |
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93 | |
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94 | return EVMETHOD_EPOLL; |
89 | } |
95 | } |
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96 | |
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97 | static void |
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98 | epoll_destroy (EV_P) |
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99 | { |
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100 | close (epoll_fd); |
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101 | |
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102 | free (epoll_events); |
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103 | } |
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104 | |
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105 | static void |
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106 | epoll_fork (EV_P) |
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107 | { |
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108 | epoll_fd = epoll_create (256); |
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109 | fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); |
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110 | |
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111 | fd_rearm_all (EV_A); |
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112 | } |
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113 | |